Hach 2100Q Manuel D'utilisation Simplifié page 12

Option Description
Signal The Signal Average mode compensates for reading
Average fluctuations caused by drifting of sample particles
through the light path.
The X-bar icon is shown on the display when signal
averaging is on.
The Signal Average mode measures 12 times and
starts to show the average after three readings. The
final result is the average of all 12 readings.
Rapidly The Rapidly Settling Turbidity (RST) mode
Settling calculates and continuously updates the turbidity
Turbidity reading of the sample to a confidence of 95%,
(RST) based on the accumulated trend of the real time
measured values.
The RST mode is best used on samples that settle
rapidly and continuously change in value. The
reading is based on a correctly prepared sample
that is homogeneous at the beginning of the
reading. It is best applied to samples that are
greater than 20 NTU. The sample must be mixed
thoroughly by inversion immediately before inserting
it into the meter.
The target icon is shown on the display when the
Rapidly Settling Turbidity is on.
The Rapidly Settling Turbidity reads and calculates
five readings while showing intermediate results.
Section 8 Maintenance
C A U T I O N
Multiple hazards. Only qualified personnel must conduct the
tasks described in this section of the document.
12 English
8.1 Clean the meter
The meter is designed to be maintenance-free and does not require
regular cleaning for normal operation. Exterior surfaces of the meter may
be cleaned as necessary.
Note: Do not clean the meter with solvents to avoid damaging the material.
1. Clean the meter with a dust- and lint-free dry or slightly damp cloth. A
mild soap solution can also be used for liposoluble contamination.
8.2 Apply silicone oil to a sample cell
Sample cells and caps must be extremely clean and free from significant
scratches. Apply a thin coating of silicone oil on the outside of the
sample cells to mask minor imperfections and scratches that may
contribute to light scattering.
Note: Use only the provided silicone oil. This silicone oil has the same refractive
index as the sample cell glass.